JPH07246738A - Printer - Google Patents

Abstract

PURPOSE:To correct the irregularity of the cutting length due to a cutter by calculating the moving distance of the cutter to a cutting position on the basis of the average value of the feed distance of paper from the predetermined state in the past printing detected by a paper detection means. CONSTITUTION:A cutting means cuts and separates the printed part and unprinted part of paper. A pitch memory means 8 stores a plurality of the data of the feed distances of paper from a predetermined state until the specific position of the paper is detected by a paper detection means 4. A feed distance correction means 6 calculates the average of a plurality of feed distance data containing the novel feed distance data stored in the means 8 and, on the basis of this average feed distance data, a preset feed distance for feeding paper from the printing position due to a printing head 1 to the cutting position of the cutting means is corrected. A cutting control means 17 feeds the paper by the corrected feed distance by the feed distance correction means 6 after the completion of printing to allow the cutting means to cut the paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer which detects a specific position of a sheet and positions the sheet at a print position based on the detection of the specific position to perform printing.

[0002]

2. Description of the Related Art Label papers or tag papers printed by printers include those with continuous plain labels, those with no preprinting, those without perforations, etc. There is no need to position the print start position, multiple labels are affixed to the backing paper at a specified interval, pre-printed, perforated, etc. In some cases, it is necessary to position the print start position of the paper.

In order to position the sheet at the print start position, a transmissive photosensor for detecting a gap between labels and a reflective photosensor for detecting a black mark are used as a print head such as a thermal head. It is provided on the transport path (front of the print head) that feeds paper to.

That is, the positioning of the paper at the print start position is based on the distance from the print position of the print head to the detection position of the photo sensor when the leading edge of the label is detected by the photo sensor or when the black mark is detected. Then, the print start position of the paper is conveyed to the print position by the print head.

On the other hand, as the printer, for example, a cutter for cutting and separating one printed label and an unprinted label of the paper is conveyed from the print head to the outside of the apparatus for discharging the paper. The one provided on the road (behind the print head) and the peeling plate that peels off one printed label from the mount, leaving a part of it, so that the user can easily remove the printed label, Are known to be prepared for transportation.

In the case where the paper which does not need to be positioned at the print start position of the paper is used, after the printing is completed, the paper is conveyed by a preset conveyance distance based on the distance from the print position by the print head to the cutting position by the cutter. do it,
The disconnection process is performed.

Even when the paper for which the print start position of the paper has to be positioned is used, it is determined based on the distance from the print position by the print head to the cutting position by the cutter or the peeling position by the peeling plate after the printing is completed. The cutting process or the peeling is performed by carrying a predetermined carrying distance.

[0008]

However, for example, in a label paper in which a plurality of labels are adhered to a mount at a predetermined interval, all the label pitches, that is, the labels of the labels adjacent from the leading end of each label. The distance to the tip is not uniform with high accuracy and varies. In addition, the pitch of the tags also varies with the black marks printed on the back surface of the tag paper.

Further, the paper conveyed to the print head is curled in a curled shape depending on the thickness, material, and storage condition of the paper, and the position of the gap between the labels or the position of the black mark is detected by the photo sensor. There may be variations.

Therefore, in the case where the paper is positioned at the printing start position in this way, the conveyance to the cutting position by the cutter or the peeling position by the peeling plate after the printing is constant as the preset feeding distance. Therefore, there is a problem in that the cut length (cutting pitch) or the peeling length varies.

If the cut length of the paper varies,
When transporting a large number of cut labels, for example, there is a problem that it is difficult to store in a container, it is difficult to hold by hand, and the appearance is poor, and if the peeled length varies due to variations in label length. , The peeled label hangs down differently, so the peeling of the label is not uniform, that is, the label peels off from the backing sheet, or part of the label is too attached to the backing sheet, making it difficult to remove by hand. It was

Therefore, an object of the present invention is to provide a printer capable of correcting variations in the cut length by the cutter or the peel length by the peeling plate in positioning and printing the paper.

[0013]

The invention according to claim 1 is
In a printer that includes a sheet detection unit that detects a specific position of the sheet, positions the sheet based on the detection by the sheet detection unit, and prints on the sheet with a print head Cutting means for cutting and separating the portion, pitch storage means for storing a plurality of data of the transport distance of the paper from the predetermined state until the specific position of the paper is detected by the paper detection means, and a new storage means stored in the pitch storage means. The average of a plurality of transport distance data including the transport distance data of is calculated, and the transport distance set in advance for transporting the paper from the print position by the print head to the cutting position of the cutting means by the average transport distance data. And a conveying distance correcting unit that corrects the sheet, and after the printing is completed, the sheet is conveyed by the conveying distance corrected by the conveying distance correcting unit and is used by the cutting unit. It is provided with a and cutting control means for cutting the.

The invention according to claim 2 uses a label paper in which a plurality of labels are attached to a mount at predetermined intervals,
Equipped with label detection means for detecting gaps between labels,
In a printer that positions a label on the basis of the detection by the label detecting means and prints on the label positioned on the label paper by a print head, the printed label on the label paper is peeled off from the mount, leaving a part of it. Peeling means, a pitch storage means for storing a plurality of pieces of data of the transport distance of the label sheet from a predetermined state until the label detection means detects the gap between the labels, and a new transport stored in the pitch storage means. Calculate the average of multiple transport distance data including the distance data, and use this average transport distance data to calculate the preset transport distance for transporting the label paper from the print position by the print head to the peel position by the peeling means. Transport distance correcting means for correcting,
After the printing is completed, there is provided peeling and conveying means for conveying the label paper by the conveying distance corrected by the conveying distance correcting means and peeling the printed label from the mount by the peeling means.

[0015]

According to the first aspect of the invention, the data of the transport distance of the sheet from the predetermined state until the sheet detecting means detects the specific position of the sheet is stored in the pitch storing means.

At this time, the carrying distance correcting means calculates an average of a plurality of carrying distance data including the new carrying distance data stored in the pitch storing means, and the paper is used as a print head by the average carrying distance data. The transport distance set for transporting from the printing position by to the cutting position by the cutting means is corrected.

After the printing is completed, the cutting control means conveys the sheet by the conveying distance corrected by the conveying distance correcting means, and the cutting means cuts the sheet.

According to the second aspect of the invention, the data of the transport distance of the sheet from the predetermined state until the label detecting means detects the gap between the labels is stored in the pitch storing means.

At this time, the conveying distance correcting means calculates an average of a plurality of conveying distance data including the new conveying distance data stored in the pitch storing means, and the paper is used as a print head by the average conveying distance data. The transport distance set for transporting from the printing position according to to the stripping position by the stripping unit is corrected.

After the printing is completed, the peeling / conveying means conveys the paper by the conveying distance corrected by the conveying distance correcting means, and the peeling means performs the peeling with a part of the paper left.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claim 1 will be described below with reference to FIGS. The first embodiment is an application of the present invention to a thermal printer that prints on a label paper on which a plurality of labels are adhered at a predetermined interval with a thermal head.

FIG. 1 (a) is a diagram showing the schematic construction of a thermal printer to which the present invention is applied.

Reference numeral 1 is a thermal head as a print head. A platen 2 is arranged opposite to the thermal head 1. A label sheet 3 is inserted between the thermal head 1 and the platen 2, and the label sheet 3 is fed to the print position of the thermal head 1 on the conveying path (in front of the thermal head 1, that is, on the right side of FIG. 1). ), A transmissive photo sensor 4 is installed as a sheet detecting means. In addition, the label paper 3 is attached to the thermal head 1.
A cutter 5 as a cutting means is provided on the conveying path (to the rear of the thermal head 1) for discharging from the printing position to the outside of the apparatus. Although not shown, the label paper 3 is wound into a roll and set on the printer body roll support shaft.

FIG. 2 is a block diagram showing a circuit configuration of a main part of the thermal printer.

Reference numeral 6 denotes a CPU (centr
al processing unit). A ROM (read only mem) in which program data for processing performed by the CPU 6 is stored
ory) 7, RAM (random access memor) in which areas of various memories used when the CPU 5 performs processing are formed
y) 8, character ROM 9 in which font data (image data) corresponding to the code is stored, image buffer RAM 10 in which received data, dot image data, etc. are temporarily stored, host computer, etc. UART (universal asynchronous recei
Each of the ver transmitters 11 is connected to the CPU 6 via the system bus 12.

Further, the CPU 6 is the system bus 1
A head driver 13 for driving the thermal head 1 and the label paper 3 are supplied and conveyed to a printing position by the thermal head 1 via the thermal head 1
Motor driver 1 for driving a paper feed motor 14 for rotating the platen 2 for discharging and conveying the sheet from the apparatus to the outside of the apparatus
5. I / O (input / output) port 16 for inputting the detection signal output from the transmissive photo sensor 4 for detecting the gap between the labels attached to the paper, and cutting by the cutter 5 as the cutting means It is connected to a cutter driver 18 that drives a cutter motor 17 for performing the operation.

The RAM 8 is provided with a counter for counting the number of drive steps of the paper feed motor 14 so that it can be used in normal positioning control, and as the pitch storage means, the photo sensor from the start of printing. A plurality of storage areas for storing the count value (the number of steps) counted by the counter until the gap between the labels is detected by 4 are formed.

FIG. 3 shows a flow of main processing performed by the CPU 6.

When the power is turned on, RAM 8 and I /
When initialization is performed to perform processing such as initialization of the O port 16 and the initialization is completed, step 1
As the process of (ST1), a standby state is set until the data transmitted from the host computer is received.

When the data from the host computer is received, the received data is analyzed and the data buffer RA
Store in M10.

Next, as a result of this analysis, it is determined whether the received data is print data including a print command. If the received data is not print data, other processing is performed according to the received data, and the process returns to the above-described step 1 again.

If the received data is print data, based on the print data, the font data stored in the character ROM 9 is used to create a dot image in an area different from the area in which the received data of the data buffer RAM 10 is stored. Draw (expand) to.

When this drawing process is completed, step 2
As the process of (ST2), the paper feed motor 14 is driven one step, and the dot image for one line is output from the data buffer RAM 10 to the thermal head 1 via the head driver 13. By this processing, printing for one line is performed on the label paper 3.

Next, the detection signal output from the photo sensor 4 is taken in, and according to the level of this detection signal,
Perform an analysis to determine whether it is a label attachment part or a gap part. As a result of this analysis, it is confirmed whether or not it passes through the gap depending on whether or not it is the gap portion.

Here, only when it is determined that the print head has passed through the gap, the number of print end steps is calculated based on the distance from the print position of the thermal head 1 to the detection position of the photo sensor 4, and the RAM 8 is stored in the RAM 8. Set. Furthermore, the paper feed motor 1 from the start of printing to this time
The number of driving steps of 4 is stored in a predetermined storage area of the RAM 8, and the number of driving steps of this time and the RAM 8 are stored.
Calculate the average number of driving steps from the latest two driving steps already stored in the storage area of
The current driving step number is subtracted from this average driving step number. Then, the result of this subtraction is applied to the thermal head 1.
It is added to the distance from the printing position by the cutter to the cutting position by the cutter 5, and this is set in the RAM 8 as the number of steps of the corrected moving distance (conveyance distance correcting means).

That is, when the drive step number of the paper feed motor 14 from the start of printing this time to the detection of the gap of the label sheet 3 by the photo sensor 4 is Bn, the latest two drive step numbers in the past are B. Let (n-2) and B (n-1) be D, the number of steps of the distance from the printing position of the thermal head 1 to the cutting position of the cutter 5 be Dn, and the number of steps of the corrected movement distance be Dn, then Dn = D-{[(B (n-2) + B (n-1) + Bn) / 3]-
The number of steps of the moving distance is calculated by the expression Bn}.

When replacing the label paper, the RAM 8
The number of drive steps of the paper feed motor 14 from the start of printing stored until the detection of the gap of the label paper 3 by the photo sensor 4 is erased, and instead, the number of drive steps suitable for the label paper that is favorable is detected. Is set,
The average number of driving steps is calculated from the number of driving steps that match.

Next, whether or not the printing is completed is determined by whether or not the number of drive steps of the paper feed motor from the time when it is determined that the gap has been passed is equal to the number of printing completion steps set in the RAM 8. . If it is determined that the printing has not ended, the process returns to step 2 described above.

When it is judged that the printing is completed, the one-step driving of the paper feed motor 14 is repeated until the step number of the moving distance set in the RAM 8 is reached.
When the number of driving steps of the paper feed motor 14 reaches the number of steps of the moving distance set in the RAM 8, the cutter motor 17 is driven to perform the cutting operation of cutting the label paper by the cutter 5 (cutting control means).

When the cutting operation is completed, the back feed is performed by the number of steps of the moving distance set in the RAM 8. When the back feed is completed, the process of step 1 is returned to.

In the thermal printer having such a structure, as shown in FIG. 1A, the print start position of the first label on the label paper 3 is first positioned at the print position of the thermal head 1.

Printing is started in this state, and the paper feed motor 14 is sequentially driven by one step to print on the first label of the label paper 3. Label paper 3 is transported,
As shown in FIG. 1 (b), the photo sensor 4 detects the gap of the label sheet 3.

At this time, the number of printing end steps is calculated and set in the RAM 8 based on the distance from the position detected by the photo sensor 4 to the printing position by the thermal head 1. Further, the number of drive steps of the paper feed motor 14 from the start of printing to this time is stored in a predetermined storage area of the RAM 8 and averaged with the latest two previous drive step numbers stored in the RAM 8. Is calculated, and the number of steps of the moving distance for conveying the label paper 3 to the cutting position by the cutter 5 is corrected and set in the RAM 8.

The printing operation is further continued, and the paper feed motor 14 after the photo sensor 4 detects the gap.
When the number of driving steps of is equal to the number of printing end steps set in the RAM 8, it is determined that printing is completed. The state at this time is shown in FIG.

From this time, the paper feed motor 14 is driven by the number of steps of the moving distance set in the RAM 8 to set the gap between the printed label and the unprinted label on the label paper 3 to the cutter 5. Position the cutting position. The state at this time is shown in FIG.

Here, the cutter 5 is driven to cut and separate the printed label from the label paper 3, and when back feeding is performed by the number of steps of the moving distance set in the RAM 8, the initial stage as shown in FIG. Return to the state.

In FIG. 1, A is the label pitch of the first label, B is the transport distance from the start of printing until the photosensor 4 detects a gap, and C is the photosensor. 4, the transport distance from the detection position by 4 to the print position by the thermal head 1, and D indicates the transport distance from the print position by the thermal head 1 to the cut position by the cutter 5.

As described above, according to this embodiment, the RAM 8 having a plurality of storage areas for storing the transport distance of the label sheet 3 from the start of printing to the detection of the gap of the label sheet 3 by the photosensor 4 is provided. , An average value is calculated from the current transport distance and the latest two previous transport distances stored in the RAM 8, and the moving distance to the cutting position by the cutter 5 is calculated based on this average value, so that this movement is performed. If the label paper 3 is conveyed at a distance and cut by the cutter 5, variations in the cut length of the label paper 3 can be corrected. Therefore, when the cut labels are superposed, the superposition of the cut ends can be made smooth, and when a large number of cut labels are conveyed, for example, they can be easily stored in a container and easily held by hand, and The effect that the appearance is good can be obtained.

In this thermal printer,
Although the description has been given of the case where a plurality of labels are attached to the mount at a predetermined interval, the present invention is not limited to this, and label paper or tag paper having a black mark printed on the back surface, or preprinted. It is also applicable when using label paper or tag paper.

Further, an average value is obtained by combining the sheet transport distance from the start of printing until the gap of the label sheet is detected by the photo sensor 4 with the past two transport distances, and the average value up to the cutter 5 is calculated based on this average value. Although the moving distance has been calculated, the present invention is not limited to this, and the average value may be calculated together with the transportation distances of three or more times in the past.

Further, in this thermal printer, the average value of the transport distance of the label paper 3 from the start of printing to the detection of the gap of the label paper 3 by the photosensor 4 is determined with reference to the printing start in a predetermined state. However, the present invention is not limited to this, and, for example, the state in which the gap of the label paper 3 in the previous printing is detected by the photo sensor 4 is set as a predetermined state, and the previous printing by the photo sensor 4 is performed. It is also possible to obtain the average value of the transport distance of the label sheet 3 from the detection of the gap to the detection of the gap in the present printing, and to calculate the moving distance to the cutting position by the cutter 5.

Next, the embodiment of the invention described in claim 2 is shown in FIG.
It will be described with reference to FIGS. In this embodiment, the present invention is applied to a thermal printer that prints on a label paper on which a plurality of labels are attached at a predetermined interval with a thermal head.

FIG. 4 (a) is a diagram showing the schematic construction of a thermal printer to which the present invention is applied.

Reference numeral 21 is a thermal head as a print head. A platen 22 is arranged opposite to the thermal head 21. A label sheet 23 is inserted between the thermal head 21 and the platen 22, and the label sheet 23 is fed to the print position of the thermal head 21 on the conveying path (in front of the thermal head 21, that is, in FIG.
A transparent paper sensor 24 as a paper detecting means is installed on the right side of FIG.

In addition, a conveying path for ejecting the label paper 23 from the printing position of the thermal head 21 to the outside of the apparatus (
A peeling plate 25 as a peeling means is installed behind the thermal head 21, and the tip of the peeling plate 25 is used to
The label paper 23 is bent to the mount side, and the mount paper is wound by the winding roller 26.

A label sheet 2 is formed by the tip of the peeling plate 25.
3 is bent to the mount side, and the mount is wound by the winding roller 26, so that the label is peeled off from the mount at the bent portion of the label paper 23.
It projects on the extension of the transport path for discharging from the thermal head 21.

In order to detect the label which is peeled off from the mount and projected, a transmission type label detection sensor 27 is installed on the extension of the discharge conveyance path.

FIG. 6 is a block diagram showing a circuit configuration of a main part of the thermal printer.

Reference numeral 28 is a CPU which constitutes the main body of the control unit. A ROM 29 in which program data for processing performed by the CPU 28 is stored, a RAM 30 in which areas of various memories used when the CPU 28 performs processing are formed,
A character ROM 31 in which font data (image data) is stored corresponding to a code, an image buffer RAM 32 in which received data, dot image data, etc. are temporarily stored, and a UART 33 connected to a host computer via a line, respectively. , Is connected to the CPU 28 via a system bus 34.

The CPU 28 supplies the head driver 35 that operates the thermal head 21 and the label paper 23 to the printing position of the thermal head 21 via the system bus 34 and conveys them to the printing position by the thermal head 21 and the outside of the apparatus. Platen 2 for discharging and transporting to
A paper feed motor driver 37 that drives a paper feed motor 36 that rotates 2; an I / O port 38 that inputs each detection signal output from the paper sensor 24 and the label detection sensor 27; It is connected to a take-up motor driver 40 that drives a take-up motor 39 for performing a take-up operation of the mount of the label paper 23.

The RAM 30 has the paper feed motor 36.
And a count value counted by the counter from the start of printing to the detection of the gap between the labels by the paper detection sensor 24 as a pitch storage means.
A plurality of storage areas for storing (the number of steps) are formed.

FIG. 7 shows the flow of main processing performed by the CPU 28.

When the power is turned on, the RAM 30 and I
When initialization is performed to initialize the / O port 38 and the like, and this initialization is completed, a standby state is entered until the data transmitted from the host computer is received as the processing of step 1 (ST1).

When the data from the host computer is received, the received data is analyzed and the data buffer RA
Store in M32.

Next, as a result of this analysis, it is determined whether the received data is print data including a print command. here,
If the received data is not print data, other processing is performed according to the received data, and the process returns to the above-mentioned step 1 again.

If the received data is print data, based on the print data, the font data stored in the character ROM 31 is used to create a dot image in an area different from the area where the received data in the data buffer RAM 32 is stored. Draw (expand) to.

When this drawing process is completed, step 2
As the process of (ST2), the paper feed motor 36 is driven by one step, and the dot image for one line is output from the data buffer RAM 32 to the thermal head 21 via the head driver 35. By this processing, printing for one line is performed on the label paper 23.

Next, the detection signal from the paper sensor 24 is taken in, and an analysis is made to determine whether the label is a stuck portion or a gap portion based on the level of the detected signal. As a result of this analysis, it is confirmed whether or not it passes through the gap depending on whether or not it is the gap portion.

Here, only when it is determined that the sheet has passed through the gap, based on the distance from the print position by the thermal head 21 to the detection position by the paper sensor 24,
The number of print end steps is calculated and set in the RAM 30. Further, the number of drive steps of the paper feed motor 36 from the start of printing to this time is stored in the storage area of the RAM 30, and the number of drive steps of this time and the RAM are stored.
The latest past 2 already stored in 30 storage areas
The average number of driving steps is calculated from the number of times of driving steps, and the current number of driving steps is subtracted from the average number of driving steps. Then, the result of this subtraction is added to the numerical value obtained by subtracting the standard length of the portion of the label length that is not peeled from the distance from the printing position of the thermal head 1 to the peeling position of the peeling plate 25. This is set in the RAM 30 as the number of steps of the corrected movement distance (conveyance distance correction means).

That is, when the number of drive steps of the paper feed motor 36 from the start of printing this time to the detection of the gap of the label paper 23 by the paper sensor 24 is Fn, the latest two drive steps in the past are F. (n-2), F (n-1), and the peeling plate 25 from the printing position by the thermal head 21.
Let H be the number of steps of the distance to the peeling position by, and let the standard length I of the portion of the label length that is not peeled off be
Jn = (HI)-{[(F (n-2) + F (n-1) + Fn), where Jn is the number of steps of the corrected moving distance.
/ 3] -Fn} is used to calculate the number of steps of the moving distance.

When replacing the label paper 23, RA
The number of drive steps of the paper feed motor 36 from the start of printing stored in M30 to the detection of the gap of the label paper 23 by the paper sensor 24 is all erased, and instead, the drive step suitable for the replaced label paper 23. The number of driving steps is set, and the average number of driving steps is calculated based on the matching number of driving steps.

Next, whether or not the printing is completed is determined by whether or not the number of driving steps of the paper feed motor 36 from the time when it is determined that the gap has been passed is equal to the number of printing completion steps set in the RAM 30. To do. If it is determined that the printing has not ended, the process returns to step 2 described above.

When it is determined that the printing is completed, the paper feed motor 36 is repeatedly driven by one step until the number of steps of the moving distance set in the RAM 30 is reached.
(Peeling and conveying means).

The number of drive steps of the paper feed motor 30 is RA
When the number of steps of the moving distance set in M30 is reached, the detection signal from the label detection sensor 27 is fetched, and the standby state is set until the label is peeled off from the detection signal level. Become.

By the detection signal of the label detection sensor 27,
When it is detected that the label has been removed, RAM3
Back feeding is performed by the number of steps of the moving distance set to 0, and when this back feeding is finished, the process of step 1 is returned to.

In the thermal printer having such a structure, as shown in FIG. 4A, the print start position of the first label on the label paper 23 is first positioned at the print position by the thermal head 21.

Printing is started in this state, and the paper feed motor 244 is sequentially driven by one step to print on the first label of the label paper 23. The label sheet 23 is conveyed, and the gap of the label sheet 23 is detected by the sheet sensor 24, as shown in FIG. 4B.

At this time, based on the distance from the position detected by the paper sensor 24 to the print position by the thermal head 21, the number of printing end steps is calculated and set in the RAM 30. Further, the number of drive steps of the paper feed motor 36 from the start of printing to this time is stored in the storage area of the processing of the RAM 30, and is averaged with the latest two previous drive step numbers stored in the RAM 30. Is calculated, and the number of steps of the moving distance for conveying the label paper 23 to the peeling position by the peeling plate 25 is corrected and set in the RAM 30.

The printing operation is further continued, and the paper feed motor 36 after the paper sensor 24 detects the gap.
When the number of driving steps of is equal to the number of printing end steps set in the RAM 30, it is determined that printing is completed. The state at this time is shown in FIG.

From this time, the paper feed motor 36 is driven by the number of steps of the moving distance set in the RAM 30 to position the label paper 23 at the peeling position of the peeling plate 25. At this time, the first label of the label paper 23 is attached to the backing paper without being peeled off by the length obtained by adding the difference (variation) from the average label pitch of this label to the standard length of the part that is not peeled off. As it is, other peeled parts project. The state at this time is shown in FIG. 5 (b).

At this time, unless the label is detected by the label detection sensor 27 and the label is peeled off, the label paper 23 is not back-fed, and therefore the next label is not printed or issued.

When the projected label is peeled off, the label is no longer detected by the label detection sensor 27,
Back feed is performed by the detection signal of the label detection sensor 27 at this time. Then, the state returns to the initial state as shown in FIG.

4 and 5, E is the label pitch of the first label, F is the transport distance from the start of printing until the paper sensor 24 detects a gap, and G is The conveyance distance from the detection position of the paper sensor 24 to the printing position of the thermal head 21, H
Is the peeling plate 25 from the printing position by the thermal head 21.
The conveyance distance to the peeling position by is shown.

As described above, according to this thermal printer, the RAM 30 provided with a plurality of storage areas for storing the transport distance of the sheet from the start of printing to the detection of the gap of the label sheet 23 by the sheet sensor 24 is provided. This moving distance is calculated by calculating the average value from the transporting distance of 1 and the latest two transporting distances stored in the RAM 30, and calculating the moving distance to the peeling position by the peeling plate 25 based on this average value. If the label paper 23 is conveyed by, the variation of the peeled length of the label can be corrected. Therefore, since the manner of hanging down the peeled label can be made almost uniform, it is possible to obtain the effect that the peeling-off condition of the label can be made uniform.

In this embodiment as well, similar to the embodiment of the invention described in claim 1 described above, a plurality of labels are attached to the mount at a predetermined interval, but the present invention is not limited to this. The present invention is not limited to the above, but can be applied to the case where a label paper having a black mark printed on the back surface or a preprinted label paper is used.

Also in this embodiment, the transport distance of the label paper 23 from the start of printing until the gap of the label paper 23 is detected by the photosensor 4 is combined with the transport distances of the past two times to obtain an average value, The moving distance to the peeling plate 25 was calculated based on the average value, but the present invention is not limited to this, and the past 3
The average value may be obtained in combination with the transport distance of one or more times.

Further, also in this embodiment, the average value of the transport distance of the label paper 23 from the start of printing to the detection of the gap of the label paper 23 by the photo sensor 24 is calculated with reference to the printing start in the predetermined state. However, the present invention is not limited to this. For example, the state where the gap of the label paper 23 in the previous printing is detected by the photo sensor 24 is set as a predetermined state, and the previous printing by the photo sensor 24 is performed. It is also possible to obtain the average value of the transport distance of the label paper 23 from the detection of the gap to the detection of the gap in the current printing, and to calculate the movement distance to the separation plate 25.

[0088]

As described above in detail, according to the present invention,
In the case of printing by positioning the paper, calculate the moving distance to the cutting position of the cutter based on the average value of the transport distance of the paper from the predetermined state in the past printing to the detection by the paper detection means. As a result, it is possible to provide a printer that can correct the variation in the cut length due to the cutter.

Further, the peeling length by the peeling plate is calculated by calculating the moving distance to the peeling plate based on the average value of the conveying distance of the paper from the predetermined state in the past printing to the detection by the paper detecting means. It is possible to provide a printer capable of correcting the variation of

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration and an operation of main parts of a thermal printer according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of essential parts of the thermal printer of the embodiment.

FIG. 3 is a diagram showing a flow of main processing performed by the thermal printer of the embodiment.

FIG. 4 is a diagram showing the configuration and operation of essential parts of a thermal printer according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a configuration and an operation of a main part of the thermal printer of the embodiment.

FIG. 6 is a block diagram showing a circuit configuration of essential parts of the thermal printer of the embodiment.

FIG. 7 is a diagram showing a flow of main processing performed by the thermal printer of the embodiment.

[Explanation of symbols]

1, 21 ... Thermal head, 4 ... Photo sensor, 5 ... Cutter, 6, 28 ... CPU, 8, 30 ... RAM, 14,
36 ... Paper feed motor, 25 ... Peeling plate, 27 ... Label detection sensor.

Claims (2)

[Claims] 1. A printer, comprising: a paper detecting means for detecting a specific position of the paper, wherein the paper is positioned based on the detection by the paper detecting means, and printing is performed on the paper by a print head. Cutting means for cutting and separating a printed portion and an unprinted portion, and a pitch storage means for storing a plurality of data of the transport distance of the paper from a predetermined state until the specific position of the paper is detected by the paper detection means. , An average of a plurality of transport distance data including the new transport distance data stored in the pitch storage means is calculated, and the average transport distance data is used to cut the sheet from the print position by the print head to the cutting means. A transport distance correcting unit that corrects a preset transport distance for transporting to the cutting position, and a transport distance correcting unit that corrects after printing is completed. And a cutting control means for causing the cutting means to cut the paper by the conveying distance. 2. A label sheet, in which a plurality of labels are attached to a mount at predetermined intervals, is used, and a label detecting unit for detecting a gap between the labels is provided, and the label detecting unit detects the gap between the labels. In a printer that positions a label and prints on a label positioned on a label paper by a print head, a peeling means for peeling a part of the printed label on the label paper from the mount, and a predetermined unit. Pitch storage means for storing a plurality of data of the transport distance of the label sheet from the state until the label detection means detects the gap between the labels, and new transport distance data stored in the pitch storage means are included. An average of a plurality of transport distance data is calculated, and the label paper is printed at the print position by the average transport distance data. To the peeling position by the peeling means, a conveying distance correcting means for correcting a preset conveying distance, and after printing, the label paper is conveyed by the conveying distance corrected by the conveying distance correcting means. A printer comprising: a peeling / conveying unit for peeling the printed label from the mount by the peeling unit.